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Don't break down when it's cold outside.

Cerium is the most abundant rare earth metal, decomposes slowly in cold water and rapidly in hot water. The Arc'teryx Mens' Cerium LT Hooded Down Jacket is not quite as prevalent as its namesake, but does slow your decomposition in cold weather. The combination of 850-fill European goose down and strategically placed Coreloft insulation keeps you warm whether you wear the Cerium alone or under a hardshell when you're confronted with a winter tempest most storm chasers avoid.
Bigger numbers are fun when it comes to betting odds and down insulation. A higher fill-power down, like the 850-fill used in the Cerium, refers to how much space a single ounce of down occupies. The more space taken up by the down means more air is trapped between the fibers. Trapped air creates a barrier between warm air from your body and cold air in the environment, so you stay warm when it's cold outside. Taking this logic one step further, if one ounce of a certain down takes up more space than a different type of down, it stands to reason you'll need less of the 'bigger' down to keep you warm, thus reducing the weight of your jacket. In essence, this jacket's high down fill makes it both light and warm.
Since down doesn't maintain its warmth when it gets wet, the folks at Arc'teryx placed synthetic insulation in the spots that are most likely to get a bit damp. Still, while Coreloft insulation does resist moisture better than down, and an ominous drizzle won't leave you a cold, soaking mess, it's best to pair this with a waterproof shell if you know the weather is coming.
This superlight hooded jacket comes with its own stuff sack so you can easily bring it along and so your pack stays organized. The same 850-fill down fills the low-profile StormHood so your melon stays warm. (Mom was right—if you keep your head covered, you'll stay warmer.) Two zippered hand pockets hold your keys and phone, trail map and candy, or your partner's ID and lip balm.

  • Lightweight Airetica shell, 10x20D ripstop nylon
  • DWR treated
  • 850-fill European goose down in core and hood
  • Coreloft synthetic insulation, 80 and 100 g/m2
  • Trim fit, hip length
  • Low-profile StormHood
  • 9.7 ounces (M)
  • Includes stuff sack

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Here's what others have to say...


Great Lightweight Down Jacket

  • Familiarity:I've put it through the wringer
  • Fit:True to size
  • Height: 6'5"
    Weight: 240 lbs
    Size Purchased: X-Large

Arc'Teryx makes truly great product. The Cerium LT is no exception. I had owned the non-hooded version and purchased the hooded version this year. The jacket is incredibly versitile working in multiple conditions and multiple uses. I typically use it for fall and early spring camping in alpine conditions, as a layer underneath my ski shell and then running around town. The temperature range is very comfortable.


Amazing Down Beast

  • Familiarity:I've used it several times
  • Fit:True to size
  • Height: 6'2"
    Weight: 240 lbs

A crazy light stylish down jacket that packs down small. Insanely warm and so soft. It does fit a little slim but is great for layering or as a casual jacket in your colder alpine towns. It doesn't have the draw cord at the waste but I haven't had any issues with wind blowing up my back. Probably wouldn't be my first choice to wear snowboarding though because of this (I fall down a lot). I have been wearing this for my second winter in Idaho in temps of low 20's and felt fairly warm.

No internal pockets but with this jacket you're pretty much paying for the weight and fill. There are cheaper options out there (even within the Arcteryx brand) with more bells and whistles, but this would be my first choice for any activity where I'm hauling gear around and need to conserve space and weight.


Perfect fit, finally!

  • Familiarity:I've used it once or twice and have initial impressions
  • Fit:True to size
  • Height: 5'6"
    Weight: 155 lbs
    Size Purchased: Medium

I'm 5'6", 155 lbs with 38-39" chest and 31" waist and this jacket fits PERFECTLY!!! After trying several other brands to include Marmot, Basin & Range, etc, and the sizing being off (Small seemed to be made for 6' tall 135 lb guys while Medium was too baggy), I finally tried this jacket and the fit is spot on. Not too long in the waist, sleeves hit right at the wrist and it fits trim without restricting movement in the armpits like the other brands. Super warm jacket that looks fantastic. My only complaint is there aren't any internal pockets but this jacket fits so well I'm willing to overlook that. More to follow on durability and construction.


Light and Toasty

  • Familiarity:I've put it through the wringer
  • Fit:Runs small

I have been using this jacket for two years in all seasons in the high Sierra. It is an excellent insulation layer. I usually use it at night and in the early morning when temperatures are near or below freezing and I'm not active.
I want to emphasize that this is an insulation layer and must work as part of a layer system. A few other reviewers complain about some features in a way that makes me believe they are looking for a single article of clothing to keep them warm and dry in all conditions, this is not it. When combined with a shell layer and a base layer(s) this jacket will keep you toasty in wind and snow.
The Cerium LT has consistently been too warm for wearing while hiking, climbing, or skiing. The jacket is very lightweight and packs down very small and is excellent for ultralight back packing.

Which jacket is warmer? The Arc'teryx Cerium LT or the Arc'teryx Thorium AR?


For the most part the jackets will be fairly similar but looking into the details, here is a break down of the finer points:

Thorium AR (down): 750

Cerium LT (down): 850

Thorium AR (fill weight): 3.5oz

Cerium LT (fill weight): 3.35oz

Thorium AR (Synthetic insulation): 80/140grams

Cerium LT (Synthetic insulation): 80/100grams

So after looking at the breakdown of the insulationthe Thorium will have more insulation in it but in the case of the down it'll be slightly lower quality (but really 850 to 750 isn't a huge difference).

I'd look at how you want the jacket to fit since the Thorium AR is an "athletic" fit and the Cerium LT is going to be a snugger fit due to it being a "trim" fit.

Shoot me an email anytime you have questions!

Jared D.

Expert Gearhead


Thorium has more of a square cut and the Cerium has more of a trim fit. The Arc store rep had the same basic take as Jared (gear Expert) above did that they are more or less the same warmth, so it's more or less the cut you prefer.

I'm 185 lbs 5'11 and like a snug coat and the medium in the thorium was good for me, but for the Cerium i'm going to go with the large. hope that helps


Arc'teryx does it again!

  • Familiarity:I've used it once or twice and have initial impressions
  • Fit:True to size
  • Height: 5'7"
    Weight: 140 lbs
    Size Purchased: Medium

This jacket is amazing! You can wear it in such a wide temperature range and still feel very comfortable. I have worn it on warmer nights (Mid 50s) and cooler nights (Mid 20s) so far and it has been great either way. It is definitely a slim fit. I would say if you are using it for anything other than a base layer to seriously consider sizing up.

Unanswered Question

What is the best size for me - I've heard the Cerium LT is a trim fit. This would be worn as a base layer. I'm 5'8", 140lbs, 37-38" chest with 31" waist and hips. I have an Arcteryx Alpha SV size small which has plenty of room for layering up under it but as I understand it the Cerium LT is a whole other fit altogether. Thanks

I'm 5'10 and my current weight is 180 I want to layer up under this jacket for NYC winters what's your best recommendation for a comfortable fit medium or large?

Since it has a trim fit I would get the large to make it comfortable. You could probably fit into a medium but, it might be snug especially when you layer underneath it. What is your chest measurement? That is a really good indicator of how the jacket will fit.

If you have anymore questions feel free to send me an email or call!

Bill Porreca


Michael -

Just tried on the Medium and the Large at the store. I'm basically the same dimensions as you and the Large fit perfectly over an undershirt and a regular fit button up shirt. The medium was form fitting, but a bit tight in the sleeves.

I also tried on the Thorium AR Down which is a more of a regular fit/square cut and the Medium version of that was more roomy than the Large in the Cerium.


design error

  • Familiarity:I returned this product before using it
  • Fit:True to size
  • Height: 5'10"
    Weight: 190 lbs
    Size Purchased: XL

I find it hard to believe there is not a draw cord at the waist. Deal killer.

Mike, the Cerium LT Hoody is designed as a super light weight down insulator. Hence the elasticized bottom hem, super light face fabric and minimal features. If you're looking for draw cords at the waist, check out the Thorium AR Hoody.

Thoughtful design, not an error.

Are these made in China? I just got one on ebay for a deal and it says "Made in China." However, a search of the web shows that apparently a lot of Arcteryx goods are made in China. I just want to confirm as I'm returning the ebay purchase and planning to re-buy the jacket here, assuming it's not made in China. (And assuming the size is right. Everything I read about these jackets said they run small so I bought a large, but it's huge on me.)

Best Answer

It is made in China, but that doesn't mean anything. As I know this jacket definitely has counterfeit in color nighthawk and black. I suggest you to purchase from authenticated sellers.


Can't wait for winter-I live in Orlando

  • Familiarity:I've used it once or twice and have initial impressions
  • Fit:True to size
  • Height: 5'9"
    Weight: 145 lbs
    Size Purchased: small

I love the feel and fit of this jacket. I have the small (5'9", 145lbs). Fit is great. It fits perfectly under my theta AR medium shell. It feels like I am walking around in a super comfy sleeping bag. I only got to wear it once since owning it. It was warm but only in the lower 60's with a lot of wind. I can't wait to ski out west next winter!!

The small would be tight with a thick (heavy sweater) under layer. Should be no problem with a heavy long underwear layer though. My 200 wt fleece likely would be too much and would need to go over the jacket. I doubt this Florida boy will see weather requiring long undies, 200wt fleece, Cerium LT and Theta shell. Cerium and Theta should be an awesome combo.

I love the Backcountry exclusive color too. My wife is very jealous!!



  • Familiarity:I've put it through the wringer
  • Fit:True to size

I really like this jacket, it fits me well and keeps me warm in the winter



  • Familiarity:I've used it once or twice and have initial impressions
  • Fit:Runs small
  • Height: 6'2"
    Weight: 200 lbs
    Size Purchased: Large

I was looking for a light-quality down and didn't mind sacrificing features but this jacket sacrificed the wrong ones. The fabric and build quality are top-notch and the weight is acceptable but the jacket lacks a waist hem cord and backing for the zipper. That means that the jacket is totally dependent on a shell in any sort of wind. This is really disappointing and basically means that lighter jackets like the Ghost Whisperer and the Patagonia ultralight feel much warmer in all but the most tranquil of conditions. Look else-where for a jacket that can stand alone.

The size L was also very short on my torso compared to other size L jackets I've tried.

No waist hem adjustment is the worst idea in the history of down coats. Get the Montbell Frost Smoke.

If Montbell would get water resistant down there would be no reason to buy another 3.0-4.0 ounce fill weight jacket.


I like this jacket.

  • Familiarity:I've put it through the wringer
  • Fit:True to size

The hooded down is good for artic conditions.


Love this jacket

  • Familiarity:I've used it once or twice and have initial impressions
  • Fit:True to size

First impressions:

Love the fit! Pretty much echoing what many other's have said-fits like a glove. You won't look like a marshmallow which is always a good thing. My North Face down jacket makes me look huge (unfortunately not muscular huge), while this one looks nice and trim. The color is great. That is one thing I love about Arc'teryx-the colors are amazing. One thing though-I got it in Nighthawk, and I thought the accents were a nice orange. They are more of a red. It doesn't bother me, but just for future purchasers.

I have worn it in a variety of temperatures. All the way from on my trip to Chicago when it was single digits to slightly warmer days here in Virginia, when we've been in the 20s and 30s. Can't complain at all. Did a superb job keeping me from freezing in Chicago, and hasn't had me overheating in the warmer temperatures.

I haven't had the issues with it losing down like others have. Not to say it won't, but so far so good.

Random note-I love the hood. Not only does it look cool, it is also incredibly easy to adjust.

Hello, I'm torn between getting this jacket and L.L. Bean's Ultralight 850 Down Hooded Jacket. Does anyone have experience with both so that they can compare them together?

Best Answer

Haven't tried this hoodie, but I can tell you that the Bean hoodie is a little gappy in the middle, and the hood - although very good - isn't adjustable. Also - when last I checked, it wasn't available until JUNE!

I just received my LL Bean Ultralight and love it (was told it was back ordered to June 1). Very light, has Pertex shell, inside skins pocket and zip pocket that the whole jacket packs into and 3 outside zippered pockets. Got it on sale for about $170. I am 6'1, 195 and fit nicely in a Medium Tall. Nice fit. We'll see how it holds up but has a lot of features for the $.


LT = super light

  • Familiarity:I returned this product before using it
  • Fit:True to size

This is a very light jacket, around 9 oz. I was looking for a winter camping/wearing around town coat and this was much too thin. Unfortunately, it replicated what I already owned (a Wild Things PrimaLoft sweater about the same as the Patagonia down sweater). I returned it and went with the Cerium SV, which perfectly fulfilled the requirements I needed in a jacket.

Which is warmer, Cerium LT or Western Mountaineering Flash XR? Also, which is smaller when compressed?

I will be wearing one of these under a softshell jacket during multi-day alpine climbing in winter Alps.

The WM Flash XR will be warmer it has more down in it. The Cerium LT will compress more due to less down. Either or will be fine, Id say under a soft shell you are just fine with the Cerium LT.

I'll ask what's gonna be warmer n last longer this or the Patagonia down sweater

Patagonia Down sweater will be warmer and last longer but, it is not as performance oriented as the Cerium LT. The Cerium LT is meant for light, fast moving through the mountains where the Down Sweater has more of an all around purpose.


I am in love with this jacket

  • Familiarity:I've used it several times
  • Fit:True to size

Simply put, it is light as a feather, it is cut to fit your body (narrow and tall), is is warm as hell. You will not notice wearing the Cerium LT except for the fact that you won't be shivering, and when your friends try to punch you in the gut, you won't feel a thing from that 850 fill softening the blow! Yet still you won't look like the michelin man. Yes, miracles do happen.

Just go out and buy this jacket. Yes it is spendy but trust me, you will look good, you'll feel good about wearing it, and this baby doesn't compromise on performance. Rather, it excels.